The link isn’t working for me either, and the upgrade option via the Java Discovery applet doesn’t bring up any options. The SHN server location for the EZSrve firmware appears to be temporarily inaccessible.
I downloaded 02.03 earlier and it was an option on the 1.1 Discovery tool but it looks like they have put a hold on 02.03 for now. That sometimes means an issue has surfaced that they want to resolve before making the image generally available. Could also be what Stuart posted, the server could be down temporarily.
EDIT: note that the default time settings are Manual/Local after a RESET. This resolves an issue where there was a reboot when SET TIMEZONE was issued. Be sure to set the appropriate time zone and NTP if desired after a RESET.